From May 25, 2007 to June 6, 2007, Yaguchi performed in Damn Yankees, a popular 1955 Broadway musical, at the Tokyo Aoyama Theater.
Mari Wilson | Mari | Mari people | Mari Hulman George | Mari, Syria | Mari Kodama | Mari Alkatiri | My Beautiful Girl, Mari | Mari Yaguchi | Mari Pangestu | Juan Mari Brás | Mari Maseng | Mari Kiviniemi | Mari Kimura | Mari Jungstedt | Mari Hanafusa | Mari Djata | Mari Devon | Mari Carmen Aponte | Mari Andriessen | Māri | Lorenzo Cybo de Mari | Jose Mari Gonzales | Jose Mari Chan | Enzo Mari |
On the August 14, 2009 broadcast of Music Station, original Morning Musume members Yuko Nakazawa, Kaori Iida, Mari Yaguchi, Rika Ishikawa, Hitomi Yoshizawa, Nozomi Tsuji and Asami Konno did a special performance as backing dancers in a collaboration with the current members.